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The formation of invariant optical soliton structures to electric-signal in the telegraph lines on basis of the tunnel diode and chaos visualization, conserved quantities: Lie point symmetry approach

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Optik 2024年 305卷

作者： Faridi, Waqas Ali Iqbal, Mujahid Ramzan, Bilal AlQahtani, Salman A. Osman, M.S. Akinyemi, Lanre Mostafa, Almetwally M. Department of Mathematics University of Management and Technology Lahore Pakistan School of Mathematical Sciences Jiangsu University Zhenjiang212013 China Department of Physics School of Science University of Management and Technology Lahore54000 Pakistan Computer Engineering Department College of Computer and Information Sciences King Saud University Riyadh Saudi Arabia Department of Mathematics Faculty of Science Cairo University Giza12613 Egypt Department of Mathematics Hampton University HamptonVA United States Department of Information Systems College Computers and Information Science King Saud University Riyadh Saudi Arabia

This study critically examines the nonlinear Lonngren wave model, a mathematical representation used to describe waves in shallow water environments such as beaches, lakes, and rivers, as well as electrical signals in semiconductor materials like tunnel diodes. The symmetry generators take into account the Lie invariance criteria. A three-dimensional Lie algebra can be obtained by using the suggested methodology. It links translation symmetries in space and time, respectively, with conservation of mass and energy. The third symmetry pertains to scaling or dilation. Recognizing the constraints of the inverse scattering transform in addressing the Cauchy problem for this equation, the investigation adopts new auxiliary equation approach to ordinary differential equations. This approach yields closed-form analytical solutions for the wave model. The obtained solutions include a plane solution, mixed hyperbolic solution, periodic and mixed periodic solutions, mixed trigonometric solution, smooth soliton, trigonometric solution, mixed singular solution, complex solitary and singular solution. Furthermore, the study develops the Hamiltonian function of the dynamical system to discuss the total energy of the system in terms of its position and momentum. Chaos analysis is performed to describe periodic, quasi-periodic, and chaotic behaviours, and a sensitivity analysis highlights the model's sensitivity to different wave numbers. Graphical representations of selected solutions are presented in both 3-D and 2-D, illustrating the behaviour under specific physical conditions. The study concludes by identifying a comprehensive set of local conservation laws for the nonlinear Lonngren wave equation, applicable to arbitrary constant coefficients, using conservation laws multipliers. © 2024 Elsevier GmbH

关键词： Nonlinear equations

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Dealing with Imbalanced Dataset Leveraging Boundary Samples Discovered by Support Vector Data Description

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Computers, Materials & Continua 2021年第3期66卷 2691-2708页

作者： Zhengbo Luo Hamïd Parvïn Harish Garg Sultan Noman Qasem Kim-Hung Pho Zulkefli Mansor Graduate School of Information Production and SystemsWaseda UniversityTokyoJapan Institute of Research and Development Duy Tan UniversityDa Nang550000Vietnam Faculty of Information Technology Duy Tan UniversityDa Nang550000Vietnam Department of Computer Science Nourabad Mamasani BranchIslamic Azad UniversityMamasaniIran School of Mathematics Thapar Institute of Engineering and TechnologyDeemed UniversityPatialaPunjab147004India Computer Science Department College of Computer and Information SciencesAl Imam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia Computer Science Department Faculty of Applied ScienceTaiz UniversityTaizYemen Fractional Calculus Optimization and Algebra Research GroupFaculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam Fakulti Teknologi dan Sains Maklumat Universiti Kebangsaan MalaysiaSelangorMalaysia

These days,imbalanced datasets,denoted throughout the paper by ID,(a dataset that contains some(usually two)classes where one contains considerably smaller number of samples than the other(s))emerge in many real world problems(like health care systems or disease diagnosis systems,anomaly detection,fraud detection,stream based malware detection systems,and so on)and these datasets cause some problems(like under-training of minority class(es)and over-training of majority class(es),bias towards majority class(es),and so on)in classification process and ***,these datasets take the focus of many researchers in any science and there are several solutions for dealing with this *** main aim of this study for dealing with IDs is to resample the borderline samples discovered by Support Vector Data Description(SVDD).There are naturally two kinds of resampling:Under-sampling(U-S)and oversampling(O-S).The O-S may cause the occurrence of over-fitting(the occurrence of over-fitting is its main drawback).The U-S can cause the occurrence of significant information loss(the occurrence of significant information loss is its main drawback).In this study,to avoid the drawbacks of the sampling techniques,we focus on the samples that may be *** data points that can be misclassified are considered to be the borderline data points which are on border(s)between the majority class(es)and minority class(es).First by SVDD,we find the borderline examples;then,the data resampling is applied over *** the next step,the base classifier is trained on the newly created ***,we compare the result of our method in terms of Area Under Curve(AUC)and F-measure and G-mean with the other state-of-the-art *** show that our method has betterresults than the other state-of-the-art methods on our experimental study.

关键词： Imbalanced learning classification borderline examples

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Experimental Study on the Correlation of Cutting Head Vibrations and Kerf Characteristics during Abrasive Waterjet Cutting of Titanium Alloy

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Procedia CIRP 2021年 101卷 226-229页

作者： Panagiotis Karmiris-Obratański Nikolaos E. Karkalos Rafał Kudelski Emmanouil L. Papazoglou Angelos P. Markopoulos National Technical University of Athens School of Mechanical Engineering Laboratory of Manufacturing Technology Heroon Politechniou 9 15780 Athens Greece AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Manufacturing Systems al. Mickiewicza 30 30-059 Cracow Poland

Processing of hard-to-cut materials is always challenging, justifying the need of the adoption of efficient non-conventional cutting processes, such as Abrasive Waterjet (AWJ) cutting. In the present study, an experimental work on AWJ cutting of a titanium alloy is performed and analysis of the results is conducted in two steps; after the correlation between process parameters and slot depth and width is established, the correlation between cutting head vibrations and kerf characteristics is investigated, in order to determine whether it is possible to use vibration values for the monitoring of the outcome of the AWJ cutting process.

关键词： Abrasive Waterjet cutting kerf characteristics cutting head vibrations Ti-6Al-4V

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Results of laser beam profile measurements after propagation over untwisted and twisted silica hollow-GeO2-doped-ring core microstructured optical fibers, combined with large core multimode optical fiber

Results of laser beam profile measurements after propagation...

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Optical Technologies for Telecommunications 2023

作者： Bourdine, Anton V. Evtushenko, Alexander S. Pchelkin, Grigori A. Dashkov, Michael V. Ter-Nersesyants, Egishe V. Zaitseva, Elena S. Gizatulin, Azat R. Igumenov, Alexander Yu. Kolesnikov, Oleg V. Khadjaev, Mukhammadzoir S. Meshkov, Ivan K. Nikulina, Tatiana V. Osadchii, Kirill V. Saharia, Ankur Singh, Ghanshyam Sutorin, Daniil A. Tiwari, Manish Pashin, Stanislav S. Demidov, Vladimir V. Dukelskii, Konstantin V. Dept. of Communication Lines Povolzhskiy State University of Telecommunications and Informatics 77 Moscow av. Samara443090 Russia JSC "Scientific Production Association State Optical Institute named after S.I. Vavilov" 36/1 Babushkin str. St. Petersburg192171 Russia "OptoFiber Lab" LLC Skolkovo Innovation Center 7 Nobel str. Moscow143026 Russia Dept. of Photonics and Communication Lines Saint Petersburg State University of Telecommunications named after M.A. Bonch-Bruevich 22 Bolshevikov av. St. Petersburg193232 Russia Dept. of Telecommunication Systems Ufa University of Science and Technology 32 Zaki Validi Str. Ufa450076 Russia Dept. of General Physics Moscow Institute of Physics and Technology 9 Institutskiy per. Moscow Region Dolgoprudny141700 Russia "T8" LLC 44-41 Krasnobogatyrskaya street Moscow107076 Russia Dept. of Guiding Mediums for Telecommunication Systems Moscow Technical University of Communications and Informatics 8a Aviamotornaya str. Moscow111024 Russia Dept. of Telecommunication Engineering Samarkand branch of Tashkent University of Information Technology named after Mukhammad al-Khwarizmi 2A Ibn Sino str. Samarkand140100 Uzbekistan Optoelectronics and Photonics Research Lab Department of Electronics and Communication Engineering Manipal University Jaipur303007 India Department of Electronics and Communication Engineering School of Electrical and Electronics & Communication Engineering Malaviya National Institute of Technology J.L.N Road Rajasthan Jaipur302017 India Faculty of Photonics and Optical Information School of Photonics ITMO University bldg. A 49 Kronverksky alley St. Petersburg197101 Russia 77 Moscow av. Samara443090 Russia

ISBN: (纸本)9781510680036

This work reports results of laser beam profile measurements, performed for earlier on designed and successfully fabricated silica few-mode microstructured optical fiber (MOF) with hollow-GeO2-doped-ring core (HRC). We compared two drawn from the same preform HRC MOF samples without and with induced during the drawing process twisting of 790 revolutions per meter. Researched silica HRC MOF with outer diameter 65 µm contains hollow ring-core inner diameter of 30.5 µm with wall thickness of 1.7 µm and refractive index difference Δn = 0.03;90 air holes, placed over typical hexagonal geometry in the periphery domain from the outside HRC at the distance 14 µm, with hole averaged diameter 2.5 µm and pitch 7.5 µm. According to simulation results (mode analysis, performed by rigorous finite element method via commercially available software COMSOL Multiphysics®), it supports two guided LP-modes (fundamental LP01 and the first higher-order LP11) or 4 HE/EH odd and even eigenmodes – HE11/EH11 and HE21/EH21, respectively. We present some results of laser beam profile measurements, performed under various launching conditions (different laser sources as well as excited optical fibers (both commercially available singlemode optical fiber of ITU-T Rec. G.652 and multimode optical fiber 50/125 of ISO/IEC Cat. OM2+/OM3)) at the output ends of researched HRC MOF twisted and untwisted samples as well as at the output end of large core multimode optical fiber 100/125, aligned with excited HRC MOF. © 2024 SPIE.

关键词： ISO Standards

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Estimating earthquake peak ground acceleration and intensity using short-time Fourier and wavelet transform techniques: a case study at Odisha, India

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Arabian Journal of Geosciences 2022年第11期15卷 1-16页

作者： Jena, Ratiranjan Al-Amri, Abdullah Malulud, Khairul Nizam Abdul Shanableh, Abdallah Al-Ruzouq, Rami Center for Advanced Modeling and Geospatial Information Systems School of Civil and Environmental Engieering Faculty of Engineering and Information Technology University of Technology Sydney Sydney Australia GIS & Remote Sensing Center Research Institute of Sciences and Engineering University of Sharjah Sharjah United Arab Emirates Civil and Environmental Engineering Department University of Sharjah Sharjah United Arab Emirates Department of Geology and Geophysics College of Science King Saud University Riyadh Saudi Arabia Earth Observation Center Institute of Climate Change Universiti Kebangsaan Malaysia Bangi Malaysia

Seismic hazard assessment is indispensable to improve and update the earthquake peak ground acceleration (PGA) and intensity map. Although a lot of work has been done on earthquake hazard assessment using various mathematical functions and spatial technologies, however, limited studies could be seen on estimating PGA and intensity variation using the powerful wavelets tool. This paper analyzed the location-frequency characteristics of PGA, intensity, and their magnitude values based on short-time Fourier transform (STFT) and continuous wavelet transform (CWT) techniques. The models were implemented in the Indian state of Odisha. Earthquake ground motion is a random process that depends on lithology, amplification factors, structural features, and complicated tectonics of a given location. Four STFTs, namely Rectangle, Welch, Hanning, and Hamming and four CWT techniques such as Morlet, Paul (k=2), derivative of Gaussian DOG (k=2), and DOG (k=6) were implemented to study earthquake PGA in horizontal directions and their motion intensities. This study would help to locate the long-period ground motion in all the event locations. This research could help in identifying the areas, where the power of long-period ground motions could trigger structural damage. This study concludes that Hanning and Hamming’s windows are superior to others in STFT, and DOG (k=6) is better than others in CWT analysis. Detailed seismic wave analysis and long-period ground motions study are required to minimize the structural damage during destructive earthquakes. Hence, wavelet techniques could be useful to specify the seismically active locations and local structural features.

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Measuring the effectiveness of qualitative education in a practical human resource development course based on changes in self-evaluation and objective evaluation

Computer Software

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Computer Software 2021年第1期38卷 52-64页

作者： Saiki, Sachio Nakamura, Masahide Fukuyasu, Naoki Kanda, Tetsuya Kusumoto, Shinji Ichikawa, Kohei Yoshida, Shinichi Graduate School of System Informatics Kobe University Japan Faculty of Systems Engineering Wakayama University Japan Graduate School of Information Science and Technology Osaka University Japan Graduate School of Science and Technology Nara Institute of Science and Technology Japan School of Information Kochi University of Technology Japan

In PBL, it is often pointed out that it is difficult to qualitatively evaluate the improvement of students' fundamental competencies for working persons. In this study, we propose a method to evaluate students' growth and to improve classes through self-evaluation by students and objective evaluation by a third party as an approach to qualitative evaluation of PBL courses. In the proposed method, we aim to evaluate the validity of the subjective self-evaluation by the students before and after taking the PBL course, based on the objective evaluation. In this paper, we report on the evaluation results of the PBL course in 2017 and 2018 by the proposed method using the self-evaluation of fundamental competencies for working persons before and after taking the PBL course and the objective evaluation through PROG competency test. © 2021 Japan Society for Software Science and technology. All rights reserved.

关键词： Students

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Multimodal brain tumor segmentation and classification from MRI scans based on optimized DeepLabV3+ and interpreted networks information fusion empowered with explainable AI

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Computers in Biology and Medicine 2024年 182卷 109183-109183页

作者： Ullah, Muhammad Sami Khan, Muhammad Attique Albarakati, Hussain Mubarak Damaševičius, Robertas Alsenan, Shrooq Department of Computer Science HITEC University Taxila47080 Pakistan Department of Artificial Intelligence College of Computer Engineering and Science Prince Mohammad Bin Fahd University Al Khobar Saudi Arabia Computer and Network Engineering Department College of Computing Umm Al-Qura University Makkah24382 Saudi Arabia Faculty of Applied Mathematics Silesian University of Technology Gliwice44-100 Poland Information Systems Department College of Computer and Information Sciences Princess Nourah Bint Abdulrahman University P.O. Box 84428 Riyadh11671 Saudi Arabia

Explainable artificial intelligence (XAI) aims to offer machine learning (ML) methods that enable people to comprehend, properly trust, and create more explainable models. In medical imaging, XAI has been adopted to interpret deep learning black box models to demonstrate the trustworthiness of machine decisions and predictions. In this work, we proposed a deep learning and explainable AI-based framework for segmenting and classifying brain tumors. The proposed framework consists of two parts. The first part, encoder-decoder-based DeepLabv3+ architecture, is implemented with Bayesian Optimization (BO) based hyperparameter initialization. The different scales are performed, and features are extracted through the Atrous Spatial Pyramid Pooling (ASPP) technique. The extracted features are passed to the output layer for tumor segmentation. In the second part of the proposed framework, two customized models have been proposed named Inverted Residual Bottleneck 96 layers (IRB-96) and Inverted Residual Bottleneck Self-Attention (IRB-Self). Both models are trained on the selected brain tumor datasets and extracted features from the global average pooling and self-attention layers. Features are fused using a serial approach, and classification is performed. The BO-based hyperparameters optimization of the neural network classifiers is performed and the classification results have been optimized. An XAI method named LIME is implemented to check the interpretability of the proposed models. The experimental process of the proposed framework was performed on the Figshare dataset, and an average segmentation accuracy of 92.68 % and classification accuracy of 95.42 % were obtained, respectively. Compared with state-of-the-art techniques, the proposed framework shows improved accuracy. © 2024 Elsevier Ltd

关键词： Data fusion

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Identification of the decision-making model for selecting an information system 24

Identification of the decision-making model for selecting an...

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24th KES International Conference on Knowledge-Based and Intelligent Information and engineering systems, KES 2020

作者： Paradowski, Bartosz Drazek, Zygmunt Research Team on Intelligent Decision Support Systems Department of Artificial Intelligence and Applied Mathematics Faculty of Computer Science and Information Technology West Pomeranian University of Technology in Szczecin ul. Zolnierska 49 Szczecin71-210 Poland Department of Information Systems Engineering Faculty of Economics Finance and Management University of Szczecin Mickiewicza 64 Szczecin71-101 Poland

The right choice of information system for a company plays a vital role, therefore research to make it easier to choose the right IT system is very important. In the paper, we present research on the identification of a decision model supporting the decision on choosing the right IT system for the company. The study case is based on a literature example, which takes into account five basic criteria that influence the choice of an IT system by an entrepreneur. Then, using the COMET Object Characteristics Method, a model based on 243 characteristic objects is identified. In the following, the values from the decision matrix and the results are compared with each other. An additional model can be used to assess the sensitivity of the received solution. Finally, the most important conclusions and recommendations for further work were formulated. © 2020 The Authors. Published by Elsevier B.V.

关键词： Decision making

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A Comparative Study of Job-Related Stress in Long-Term Care Workers in Japan and China 9

A Comparative Study of Job-Related Stress in Long-Term Care ...

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9th International Congress on Advanced Applied Informatics, IIAI-AAI 2020

作者： Yu, Yating Taki, Seiko Takanokura, Masato Kawakami, Masaru Yamada, Tetsuo Liang, Shuyu Kitami Institute of Technology Regional Management Engineering Course Kitami Japan Chiba Institute of Technology Faculty of Social Systems Science Department of Management Information Science Chiba Japan Kanagawa University Faculty of Engineering Department of Industrial Engineering and Management Yokohama Japan Jichi Medical University Faculty of Nursing Tochigi Japan The University of Electro-Communications Department of Informatics Tokyo Japan Shandong University Data Science Institute Jian China

ISBN: (纸本)9781728173979

Japan revised and implemented the Occupational Safety and Health Act in December 2015 to mandate that businesses with 50 or more workers have all of their workers tested for stress annually. In China, one effect of the 'one child policy' and the nuclearization of the family has been that the number of children has decreased, while the number of elderly people living alone continues to grow. This growth is increasing the demand for long-term care workers. However, because the aging of the Chinese population has been more rapid than in Japan, and China has yet to develop a long-term care system to cope with the aging of its population, the burden on long-term care staff appears to be increasing. Although the resulting need for more support for long-term care staff has become an issue, China has yet to develop a mental health policy like that of Japan that mandates the monitoring of mental health, for example, through annual testing of workers for stress. As a result, the factors underlying long-term care worker stress have yet to be *** study attempted to discover, through a comparison of long-term care worker stress in Japan and China, the kinds of job-related stress care workers tended to have and what the principal underlying factors resulting in high levels of stress may be in each country. To that end, data were collected on workers' psychological and physical stress using the Brief Job Stress Questionnaire (BJSQ) and analyzed to find out how stress may differ by country, gender, job responsibilities, having to work night shifts, or having certain qualifications. © 2020 IEEE.

关键词： Health

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NPU Thermal Management

NPU Thermal Management

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作者： Amrouch, Hussam Zervakis, Georgios Salamin, Sami Kattan, Hammam Anagnostopoulos, Iraklis Henkel, Jorg in the Computer Science Electrical Engineering Faculty University of Stuttgart Stuttgart Germany Chair for Embedded Systems Karlsruhe Institute of Technology Karlsruhe Germany Department of Electrical and Computer Engineering Southern Illinois University CarbondaleIL United States

Neural processing units (NPUs) are becoming an integral part in all modern computing systems due to their substantial role in accelerating neural networks (NNs). The significant improvements in cost-energy-performance stem from the massive array of multiply accumulate (MAC) units that remarkably boosts the throughput of NN inference. In this work, we are the first to investigate the thermal challenges that NPUs bring, revealing how MAC arrays, which form the heart of any NPU, impose serious thermal bottlenecks to on-chip systems due to their excessive power densities. For the first time, we explore: 1) the effectiveness of precision scaling and frequency scaling (FS) in temperature reductions and 2) how advanced on-chip cooling using superlattice thin-film thermoelectric (TE) open doors for new tradeoffs between temperature, throughput, cooling cost, and inference accuracy in NPU chips. Our work unveils that hybrid thermal management, which composes different means to reduce the NPU temperature, is a key. To achieve that, we propose and implement PFS-TE technique that couples precision and FS together with superlattice TE cooling for effective NPU thermal management. Using commercial signoff tools, we obtain accurate power and timing analysis of MAC arrays after a full-chip design is performed based on 14-nm Intel FinFET technology. Then, multiphysics simulations using finite-element methods are carried out for accurate heat simulations in the presence and absence of on-chip cooling. Afterward, comprehensive design-space exploration is presented to demonstrate the Pareto frontier and the existing tradeoffs between temperature reductions, power overheads due to cooling, throughput, and inference accuracy. Using a wide range of NNs trained for image classification, experimental results demonstrate that our novel NPU thermal management increases the inference efficiency (TOPS/Joule) by $1.33\times $ , $1.87\times $ , and $2\times $ under different temperature constrain

关键词： Temperature control

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